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Metallizing nozzle
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Place of Origin: | China |
Product Description
Metallizingis the general name for the technique of coating metal on the surface ofobjects. Metallic coatings may be decorative, protective or functional.
Techniques for metallization started as earlyas mirror making. In 1835, Justus von Liebig discovered the process of coatinga glass surface with metallic silver, making the glass mirror one of theearliest items being metallized. Plating other non-metallic objects grewrapidly with introduction of ABS plastic. Because a non-metallic object tendsto be a poor electrical conductor, the object's surface must be made conductivebefore plating can be performed. The plastic part is first etched chemically bya suitable process, such as dipping in a hot chromic acid-sulfuric acidmixture. The etched surface is sensitised and activated by first dipping intin(II) chloride solution, then palladium chloride solution. The processedsurface is then coated with electroless copper or nickel before furtherplating. This process gives useful (about 1 to 6 kgf/cm or 10 to 60 N/cm or 5to 35 lbf/in) adhesion force, but is much weaker than actual metal-to-metaladhesion strength.
Vacuum metallizing involves heating thecoating metal to its boiling point in a vacuum chamber, then letting condensationdeposit the metal on the substrate's surface. Resistance heating, electronbeam, or plasma heating is used to vaporize the coating metal. Vacuummetallizing was used to deposit aluminum on the large glass mirrors ofreflecting telescopes, such as with the Hale telescope.
Thermal spray processes are often referred toas metallizing. Metals applied in such a manner provide corrosion protection tosteel for decades longer than paint alone. Zinc and aluminum are the mostcommonly used materials for metallizing steel structures.
Cold sprayable metal technology is ametallizing process that seamlessly applies cold sprayable or puttyable metalto almost any surface. The composite metal consists of two (waterbased binder)or three different ingredients: metal powder, binder and hardener.
The mixture of the ingredients is cast orsprayed on the substrate at room temperature. The desired effect and thenecessary final treatment define the thickness of the layer, which normallyvaries between 80 and 150 µm. After the spraying process the work piece shouldrest for approximately 60 minutes. Then the work piece is dried for 6-12 hoursat a temperature of 20-60 °C. Afterwards the surface is ready for the nexttreatment steps.
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